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JAMES M. MORGAN, OF PORT WASHINGTON, WISCONSIN.

REVOLVING CHAIR.

SPECIFICATION forming part of Letters Patent No. 547,963, dated October 15, 1895.

Application led August 12,1895. Serial No. 558,988. (llo model.)

To .a/ZZ whom it may concern;

Be it known that I, JAMES M. MORGAN, of Port Washington, in the county of Ozaukee and State of Wisconsin, have invented a new and useful Improvement in'RcfQ Chairs, of which the following is a descr1ption, reference being had to the accompanying drawings, which are a part of this specification.

The present invention relates to an iinprovement in the devices for which Letters Patent No. 537,988 were issued to me on April 23, 1895.

The object of the invention is to provide means for readily and surely inserting the longitudinally-grooved chair-spindle in the encircling and supporting sleeve, said sleeve being provided with an inwardly-projecting and obstructing lug.

The invention consists of the parts and combination of parts hereinafter described and claimed or their equivalents.

In the drawings, Figure l is a central vertical section of the hub of a revolving chair with the devices to which my invention relates in elevation therewith. Fig. 2 is a central vertical section of the hub and other devices shown in Fig. l. Figs. 3 and 4 are each elevations of a fragment of therlover portion of the chair-spindle and disclose the principal feature of my present invention. Fig.5 is a view of the lower end of the chair-spindle. Fig. 6 is a plan of the sleeve in which the spindle is inserted.

As my present invention involves only a small portion of the devices shown in the drawings, and as the same devices are in the main shown in my former patent, it will be sufficient now to describe them very briefly, particularly so far as they do not directly involve the present invention.

In the drawings, A is a metal hub supported on the legs B. The hub is bored centrally vertically, the upper portion being of greater diameter than the lower portion, forming an annular shoulder O medially in the hub, the bore in both parts being cylindrical.

D is a cylindrical sleeve fitting loosely in the upper enlarged portion of the bore and resting revolubly on the shoulder C.

E vis the screw-threaded spindle, and a sleeve-like nut F ts and is rotatable on the screw of the spindle. v

G is a hand-wheel integral with or fixed on the nut F, by which it is conveniently rotated.

Il is a projection on the lower end of the nut, which normally lits releasably in a complementary recess Il therefor in the top of the sleeve D.

K is an annular groove in the exterior surface of the nut F, into which ascrew-threaded pin L projects, the pin turning by its thread through the hub A. The pin is adapted to retain the parts in place revolubly when inserted in the hub in the manner indicated in Fig. 1. The foregoing described parts are only incidentally connected with my present invention.

The spindle E has a longitudinal groove or channel N cut in its periphery through the thread thereon and preferably a little into the body of the spindle. The sleeve D is provided with an inwardly-proj ecting lug M, preferably in the form of a iin 0r feather integral with the sleeve, which tin is adapted to fit in the groove N in the spindle and permit of the longitudinal movement of the spindle in the sleeve, but compelling concurrent rotation of the sleeve with the spindle. When the parts are in position, as shown in Figs. l and 2, the nut F rests on the top of the sleeve D, the lug M is in the groove N, so that the spindle and the sleeve must revolve together, and the nut F normally rotates with the sleeve and spindle.

In assembling or putting the parts together the practice is first to drop the sleeve D into place in the bore of the hub A, then place the nut F in the hub on the sleeve and secure it therein revolubly by the pin L, and thereafter to insert the spindle in the nut and. un it down, holding the nut against revolution.

Before my present invention was produced spindles were made with a rounded-off end, and it was also common to chamfer off the end of the spindle with a chamfer of equal depth and height entirely around the spindle; but it was found that on inserting the spindle in the nut and turning it down so that its point should enter the sleeve D it was difficult to bring the groove N to register with the lug M, as the parts, being hidden within the bore of the hub, could not be adjusted by sight so as to register as they came together, and if the spindle were permitted to rest on the ICO,

top of the sleeve and the spindle were then rotated to brin gthe grooveN into registration with the lug M the spindle would not ride around on the sleeve until the groove andtlug should register; but the friction between the spindle and the sleeve would cause the sleeve itself to rotate on its seat with the spindle and thus prevent the relative proper adjustment of the spindle on the sleeve. To overcome this difficulty and annoyance and to provide means whereby the groove N could be readily made to register with the lug M and the lug could be made to enter the groove notwithstanding the parts were within the bore of the hub and out of sight, I forni the spindle E at its end with a spiral conical out or cliauifcr, commencing at one side oi' the groove N and extending around the spindle spirally in the direction of and in conformity with the thread of the screw, producing the spiral conical chamter seen at P and producing the radially-disposed face or lip R in a plane of a wall of the groove N. This face R is in the plane of that Wall of the groove at the rear, (in following the thread upwardly on the spiudle,) so that in turning the spindie down while it rests lightly in the top of the sleeve or upon the lug M (if the lug is be low the top of the sleeve) the spindle will as it turns go down a little in the sleeve and the face R will come in contact with the side ot' the lug M, in which position the lug will register with the groove N, and then, on continuing to turn the spindle down, the lug will enter the groove and go up in it, holding the sleeve to rotation with the spindle. This construction is also well adapted for convenientlyT and readily entering the spindle in the nultF when the nut and spindle are to be connected together. 'l

What 'I claim as rny invention, and desire to secure by Letters Patent, is-

1. In a chair iron, the combination with a sleeve having an inwardly projecting lug, of a screw-threaded spindle having a longitudinal groove the end of which spindle is beveled off or chamfered spirally conically the continuous surface of which chamfer terminates at one wall ot' the groove in a radially disposed shoulder or face, substantially as described.

2. The combination with a hub and a sleeve supported revolubly in the hub the sleeve laving an inwardly projecting lug, of a screwthreaded spindle and a nut turning thereon, said spindle having a longitudinal groove adapted to receive the lug ot' the sleeve therein, and the end of which spindle is chamfered spirally conically, the continuons surface of which chamfer terminates at one wall of the groove in a radially disposed shoulder or face, substantially as described.

In testimony whereof I ailix my signature in presence of two witnesses.

JAMES M. MORGAN.

Witnesses:

GEO. D. SHERIFFS, C. T. BENEDICT. 

